A Point Charge +Q Is Located on the X Axis

question 69

Multiple Choice

A point charge +Q is located on the x axis at x = a, and a second point charge −Q is located on the x axis at x = −a. A Gaussian surface with radius r = 2a is centered at the origin. The flux through this Gaussian surface is

• A) zero because the negative flux over one hemisphere is equal to the positive flux over the other.
• B) greater than zero.
• C) zero because at every point on the surface the electric field has no component perpendicular to the surface.
• D) zero because the electric field is zero at every point on the surface.
• E) none of the above.